Electric Power Tools

2. The electric power tools as defined in claim 1 wherein the physical quantity comprises a torque acting on a rotating shaft or a rotating shaft angle of the rotating shaft.

3. The electric power tools as defined in claim 2 wherein the electric power tool further comprises a display for viewing the physical quantity computed based on the signals about the measurement values, wherein the display is connected through a wired line to the outputting device.

4. The electric power tool as defined in claim 3 wherein the electric power tool comprises a tightening machine.

5. The electric power tool as defined in claim 4 wherein the tightening machine includes an inner shaft with a socket that can fit a fastening member and an outer shaft to hold a reaction-force receiver, and the sensor is mounted on the inner shaft.

6. The electric power tool as defined in claim 2 wherein the electric power tool comprises a tightening machine.

7. The electric power tool as defined in claim 6 wherein the tightening machine includes an inner shaft with a socket that can fit a fastening member and an outer shaft to hold a reaction-force receiver, and the sensor is mounted on the inner shaft.

8. The electric power tools as defined in claim 1 wherein the electric power tool further comprises a display for viewing the physical quantity computed based on the signals about the measurement values, wherein the display is connected through a wired line to the outputting device.

9. The electric power tool as defined in claim 8 wherein the electric power tool comprises a tightening machine.

10. The electric power tool as defined in claim 9 wherein the tightening machine includes an inner shaft with a socket that can fit a fastening member and an outer shaft to hold a reaction-force receiver, and the sensor is mounted on the inner shaft.

11. The electric power tool as defined in claim 1 wherein the electric power tool comprises a tightening machine.

12. The electric power tool as defined in claim 11 wherein the tightening machine includes an inner shaft with a socket that can fit a fastening member and an outer shaft to hold a reaction-force receiver, and the sensor is mounted on the inner shaft.